Tm2.22Co6Sn20 and TmLi2Co6Sn20 stannides as disordered derivatives of the Cr23C6 structure type

Synopsis: The new ternary Tm2.22Co6Sn20 [a = 13.5365 (7) Å] and quaternary TmLi2Co6Sn20 [a = 13.5371 (16) Å] phases crystallize in the same cubic crystal system in the space group Fm3m and are disordered variants of the binary Cr23C6 structure type (cF116).